package com.hmall.item.service.impl;

import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmall.common.dto.PageDTO;
import com.hmall.item.mapper.ItemMapper;
import com.hmall.item.pojo.Item;
import com.hmall.item.service.IItemService;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.Date;

@Service
public class ItemService extends ServiceImpl<ItemMapper, Item> implements IItemService {

    @Autowired
    private ItemMapper itemMapper;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    /**
     * 商品上架/下架
     *
     * @param id
     * @param status
     */
    @Transactional
    @Override
    public void updateStatus(Long id, Integer status) {
        Item item = new Item();
        item.setId(id);
        item.setStatus(status);
        item.setUpdateTime(new Date());
        itemMapper.updateById(item);
        // update tb_item set status = ? where id = ?
        //this.update().set("status",status).eq("id",id).update();

        //根据上下架判断RoutingKey
        String routingKey = status == 1 ? "item.up" : "item.down";
        //发送消息
        rabbitTemplate.convertAndSend("item.topic",routingKey,id);
    }

    /**
     * 增减商品库存
     *
     * @param itemId
     * @param num
     */
    @Transactional
    @Override
    public void updateStock(Long itemId, Integer num) {
        try {
            //update tb_item set stock = stock - #{num} where id = #{itemId}
            update().setSql("stock = stock - " + num).eq("id",itemId).update();
        } catch (Exception e) {
            throw new RuntimeException("库存不足！");
        }
    }

}
